When using the repeat function (the R key) on notes, the repeated section starts at the next note position. When using the repeat on a selected slur, it starts on the same note as the end of the selected slur.
Alt-clicking the new slur into the right place works, of course, but it would be that little bit easier to just be able to hit R several times when the situation warrants it.
Thanks for pointing this out. The reason it doesn’t “just work” is because of the way the slur duration is specified: the slur ends at the start of the note to which its right-hand end attaches, rather than at its end, so it would need some special-case handling in the repeat code to work as you would expect. One day…